174 AGRICULTURAL CHEMISTRY 



remove from the soil 49.1 pounds of potash. In the same way, the 

 amount of each separate element removed from the soil can be 

 calculated. 



Problem 2. Calculate the pounds of total ash, K 2 O, CaO, MgO, 

 and P 2 O 5 removed in 25 bushels of wheat. 



Problem j. Calculate the same ingredients removed in 1,500 

 pounds of wheat straw. Compare these amounts with the corre- 

 sponding elements removed in the grain (Problem 2). 



Problem ^.Calculate the CaO, MgO, K 2 O, and P 2 O 5 removed 

 in 50 bushels of oats weighing 32 pounds per bushel. 



Problem j. Calculate the same for 40 bushels of barley weigh- 

 ing 48 pounds per bushel. In what respects does the mineral food 

 of barley differ from the mineral food of wheat? 



Problem 6. How much P 2 O 5 is removed in 15 bushels of flax ? 



